Clinics in Shoulder and Elbow

Korean Shoulder and Elbow Society (대한견·주관절의학회)
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Discovery Elbow System arthroplasty polyethylene bearing exchange: outcomes and experience

  • Daniel L J Morris (Department of Trauma and Orthopaedics, University Hospitals of Derby and Burton NHS Foundation Trust) ;
  • Katherine Walstow (Department of Trauma and Orthopaedics, University Hospitals of Derby and Burton NHS Foundation Trust) ;
  • Lisa Pitt (Department of Trauma and Orthopaedics, University Hospitals of Derby and Burton NHS Foundation Trust) ;
  • Marie Morgan (Department of Trauma and Orthopaedics, University Hospitals of Derby and Burton NHS Foundation Trust) ;
  • Amol A Tambe (Department of Trauma and Orthopaedics, University Hospitals of Derby and Burton NHS Foundation Trust) ;
  • David I Clark (Department of Trauma and Orthopaedics, University Hospitals of Derby and Burton NHS Foundation Trust) ;
  • Timothy Cresswell (Department of Trauma and Orthopaedics, University Hospitals of Derby and Burton NHS Foundation Trust) ;
  • Marius P Espag (Department of Trauma and Orthopaedics, University Hospitals of Derby and Burton NHS Foundation Trust)
  • Received : 2023.07.24
  • Accepted : 2023.09.25
  • Published : 2024.03.01
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Abstract

Background: The Discovery Elbow System (DES) utilizes a polyethylene bearing within the ulnar component. An exchange bearing requires preoperative freezing and implantation within 2 minutes of freezer removal to allow insertion. We report our outcomes and experience using this technique. Methods: This was an analysis of a two-surgeon consecutive series of DES bearing exchange. Inclusion criteria included patients in which exchange was attempted with a minimum 1-year follow-up. Clinical and radiographic review was performed 1, 2, 3, 5, 8 and 10 years postoperative. Outcome measures included range of movement, Oxford Elbow Score (OES), Mayo Elbow Performance Score (MEPS), complications and requirement for revision surgery. Results: Eleven DESs in 10 patients were included. Indications were bearing wear encountered during humeral component revision (n=5); bearing failure (n=4); and infection treated with debridement, antibiotics and implant retention (DAIR; n=2). Bearing exchange was conducted on the first attempt in 10 cases. One case required a second attempt. One patient developed infection postoperatively managed with two-stage revision. Mean follow-up of the bearing exchange DES was 3 years. No further surgery was required, with no infection recurrence in DAIR cases. Mean elbow flexion-extension and pronosupination arcs were 107°(±22°) and 140° (±26°). Mean OES was 36/48 (±12) and MEPS was 83/100 (±19). Conclusions: Our results support the use of DES bearing exchange in cases of bearing wear with well-fixed stems or acute infection. This series provides surgeons managing DES arthroplasty with management principles, successful and reproducible surgical techniques and expected clinical outcomes in performing DES polyethylene bearing exchange. Level of evidence: IV.

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References

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